BA38.1x50.8x9.53 1500 2000 0375 High Pressure Piston Rod Hydraulic Oil Seal

1. Product Overview

The BA type seal is a symmetrical combined PU hydraulic seal, also known as PARK-O-PAK U+O combination seal. It is a compact reciprocating seal specially designed for hydraulic cylinder systems. Featuring a universal symmetrical structure, it can be used for both piston rod and piston sealing, greatly simplifying model selection and inventory management for hydraulic equipment.

This seal adopts a two-piece composite structure of wear-resistant polyurethane main body and elastic O-ring inner core. It delivers excellent low-pressure tightness, high pressure resistance and anti-extrusion performance, solving the problems of oil leakage and crawling of hydraulic cylinders under low pressure and fluctuating pressure working conditions.

2. Standard Product Model

Model No.: BA38.1-50.8-9.53

Size Specification: 38.1mm × 50.8mm × 9.53mm (1.5" × 2.0" × 0.375")

Pressure Grade: 1500PSI / 2000PSI (103bar / 138bar)

Standard Section: 0.375 inch (AS568 Standard)

4. Technical Performance Parameters

• Working Pressure: ≤350bar (35MPa), peak pressure up to 400bar

• Working Temperature: -35℃ ~ +80℃ (NBR O-ring); -20℃ ~ +150℃ (FKM O-ring)

• Maximum Sliding Speed: ≤0.5m/s

• Applicable Media: Mineral hydraulic oil, hydraulic fluid, emulsified liquid, glycol flame retardant liquid

• Working Mode: Reciprocating motion bidirectional sealing

5. Core Advantages

• Dual-purpose Design: Compatible with piston rod and piston installation, reduce spare part types and inventory cost

• Excellent Low-pressure Sealing: No crawling, no leakage under low pressure and static state

• High Pressure & Impact Resistance: Integrated anti-extrusion structure, stable performance under frequent pressure fluctuation and impact load

• Super Wear Resistance: Imported polyurethane material, long service life in high-frequency reciprocating working conditions

• Easy Installation: Standard rectangular groove adaptation, no special complicated tool required

6. Application Scope

Widely used in medium and high-pressure hydraulic systems of various industrial and construction machinery, suitable for all kinds of hydraulic cylinder reciprocating sealing scenarios:

• Construction machinery: Excavators, loaders, bulldozers, forklifts

• Industrial equipment: Standard hydraulic cylinders, hydraulic presses, hydraulic stations

• Agricultural & mining machinery: Drilling rigs, telescopic cylinders, engineering plunger cylinders

7. Groove & Installation Standard

7.1 Matching Groove Size (BA38.1-50.8-9.53)

• Groove Inner Diameter: 38.1mm (H8 tolerance)

• Groove Outer Diameter: 50.8mm (h8 tolerance)

• Groove Width: 9.53mm (+0.2/0 tolerance)

• Surface Roughness: Shaft & cylinder wall Ra 0.4~0.8μm; Groove surface Ra 0.8~1.6μm

7.2 Installation Notes

• Remove burrs and sharp edges of the groove before installation to avoid damaging the seal lip

• Use a tapered guide sleeve for auxiliary installation to prevent seal distortion

• Ensure the built-in O-ring is fully embedded in the groove without twisting or dislocation

• Reserve 0.1-0.3mm axial gap to avoid extrusion damage during operation

8. Product Comparison & Replacement

BA type seals are fully compatible with Parker standard PARK-O-PAK series. It can replace imported original seals directly, with high cost performance. It is an ideal alternative for international famous brand hydraulic seals, widely used in aftermarket maintenance and equipment supporting.